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(2006•绵阳)在电视上看到的天气预报中,绵阳王朗国家级自然保护区某天的气温为...
(2006•绵阳)在电视上看到的天气预报中,绵阳王朗国家级自然保护区某天的气温为“-5℃”,表示的意思是 .
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(2006•绵阳)如图,梯形AOBC的顶点A,C在反比例函数图象上,OA∥BC,上底边OA在直线y=x上,下底边BC交x轴于E(2,0),则四边形AOEC的面积为( )
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(2006•绵阳)如图,将△ABC绕顶点A顺时针旋转60°后,得到△AB′C′,且C′为BC的中点,则C′D:DB′=( )
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(2006•绵阳)将(-sin30°)
-2,(-
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,(-
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3这三个实数按从小到大的顺序排列,正确的结果是( )
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<(-
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3B.(-sin30°)
-2<(-
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3<(-
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(2006•绵阳)x为实数,下列式子一定有意义的是( )
A.
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B.
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D.
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